#1
Which of the following pieces of glassware is used to measure small volumes of liquids precisely?
Burette
ExplanationA burette is a graduated glass tube with a tap at the bottom, used for precise measurement and dispensing of liquids.
#2
What is the function of a centrifuge in a laboratory?
To separate components of a mixture based on density
ExplanationA centrifuge spins samples at high speeds, separating components by their density.
#3
Which of the following units is used to measure mass?
Gram
ExplanationThe gram is a unit of measurement for mass in the metric system.
#4
What is the purpose of using a micropipette in a laboratory?
To transfer small volumes of liquids accurately
ExplanationMicropipettes are precision instruments for accurately transferring small liquid volumes.
#5
Which of the following techniques is commonly used for separating mixtures based on differences in boiling points?
Distillation
ExplanationDistillation separates components by exploiting differences in boiling points.
#6
What is the purpose of a spectrophotometer in a laboratory?
To measure the concentration of a substance in a solution
ExplanationA spectrophotometer measures the amount of light absorbed by a solution, indicating substance concentration.
#7
Which of the following techniques is used to determine the purity of a substance by measuring its melting point?
Recrystallization
ExplanationRecrystallization assesses substance purity by measuring the temperature at which it melts and solidifies.
#8
What is the purpose of using a vacuum filtration setup in a laboratory?
To separate insoluble solids from a liquid
ExplanationVacuum filtration separates insoluble solids from liquids using negative pressure.
#9
Which of the following techniques is used to determine the concentration of a solution by reacting it with a standard solution of known concentration?
Titration
ExplanationTitration measures solution concentration by reacting it with a solution of known concentration.